Rock-drill.



No. 635,301. Patentd Oct. 24, I899.

H. V. CONRAD & R. L. AMBROSE. ROCK DRILL.

(Application filed Feb. 16, 1899.)

(No Model.)

IINVENTORS g #amad BY MM/m ATTOR EY UNITED STATES P TENT throat,

HUGH V. OONRAD AND ROBERT L. AMBROSE, OF NORTH TARRYTOWN, NElV YORK, ASSIGNORS TO THE RAND DRILL COMPANY, OF NEW YORK, N. Y.

ROCK=DRILL..

SPECIFICATION formingpart of Letters Patent No. 635,301, dated October 24, 1899.

Application filed February 16, 1899. Serial No. 705,618. (No model.)

To all whom it may concern:

Be it known that we, HUGH V. CONRAD and ROBERT L. AMBROSE, citizens of the United States, and residents of North Tarrytown, county of VVestchester, and State of New York, have invented certain new and useful Improvements in Rock-Drills, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof.

Our invention relates to improvements in the slideways and guides of the cylinder and shell of a rock-drill; and it consists in an improved form of guide and improved means for adjusting the slideways to compensate for wear.

The object of our invention is to strengthen yet lighten the parts, to construct the guides of such shape that they will operate well in the various positions in which the drill may be set, to prevent the accidental displacement of the adjustable portion of the slideways, and to simplify and improve the construction of the parts.

We will now proceed to describe a rockdrill embodying our invention and will then point out the novel features in claims.

Figure 1 is a transverse section of a portion of a rock-drill provided with guides and slideways embodying our invention. Fig. 2 is a top view of the shell of the drill having our improved slideways therein, the adjustable portion of one of the slideways being separated therefrom in order to better illustrate the invention.

Similar reference characters designate cor responding parts in both views.

Reference character 3 designates the cylinder of a rock-drill, and 4 the shell. The said shell is arranged to be mounted on a suitable support, (not shown,) but in a manner well known. The said cylinder is arranged to be mounted upon the said shell toslide longitudinally thereon, and for this purpose is provided with longitudinally-disposed guides. The said guides are of peculiar formation and shape. In cross-section they are tapered on either side with reference to a straight line drawn through both of said ribs. Let X represent such line in the drawings at Fig. 1. It will be seen that the faces of both of the ribs converge to points on such line exterior of the said ribs. 7 7 designate stationary slideways upon which the lower faces 6 of said guides engage, as shown, and 8 8 are adjustable slideways with which the upper faces of said guides engage. 10 1O designate bolts which are fitted to extensions 11 11 of said stationary slideways on the shell, and 12 12 designate slotted holes through which the bolts are arranged to pass in the adjustable slideways. 9 9 designate the angular faces between the adjustable slideways and the shell at the point they engage with each other. Said angular faces are arranged on a line out of parallel with the line X of the drawings and at an angle otherwise than a right angle with the bolts 10. The result of the above will be that upon tightening the bolts 10 10 a constant pressure will be exerted to force the stationary slideways inwardly into more intimate contact with the faces of the guides. It will also follow as a result of this construction that the said adjustable slideways cannot get accidentally out of adjustment by slipping rearwardly consequent upon a blow or the jarring action to which they are subjected, as in order to do so they would have to stretch the said bolts or unscrew the nuts thereon.

In order to prevent an undue pressure be- -ing exerted upon the guides of the slideways,

we have provided spacing-pieces 13 between shoulders 7 a 8, formed in the stationary and adjustable slideways. Said spacing-pieces may conveniently consist of a plurality of thin strips of metal, certain of which may be removed, as it is desired, to adjust the said slideways to compensate for wear, or such spacing pieces may be of single strips of metal of predetermined thickness, which may be removed and replaced by thinner pieces as such adjustment is desired. This arrangement and combination of parts enable an eX- tremely delicate adjustment of the slideways to be made and to be absolutely maintained 5 against the violent concussion and shock to which a rock-drill is subjected. Many and various forms of guides and slideways have been made and have worked more or less efficiently when the drill has been in a horizontal or vertical position. In some cases it becomes necessary to turn the drill upon its side. An excessive amount of wear has resulted from this, causing the parts to become loose, out of adjustment, and liable to break.

Guides of the form and contour described,

, bind upon the guides; but the combination of said elements, as shown and described, results in an extremely efficient and simple device.

iVhat we claim is-- 1. In a rock-drill a cylinder provided with outwardly-proj ecting longitudinal guide-ribs, each of said ribs comprising an upper portion extending outwardly from the cylinder and a lower portion turned backwardly toward a point in a line passing between them and through the axis of the cylinder the said point being below the cylinder proper whereby the lower portion of said ribs are free at their inner ends substantially as shown, each of said ribs having two angular faces which converge toward points 011 a straight line drawn through both of said ribs, said guides being adapted to work in corresponding slideways in the shell of the drill.

2. In a rock-drill, the combination with a cylinder and guides on said cylinder composed of longitudinal ribs, which ribs are tapered in cross-section, of a shell having stationary slideways with which the said ribs are adapted to engage, an adjustable slideway adapted to engage with one of the said ribs, bolts for attaching said adjustable slideway to said shell, said bolts arranged at an angle otherwise than a right angle with the connecting-faces of the said slideway and the shell whereby they shall exert a constant pressure to force the adj ustable slideway inwardly, the holes through which the said bolts pass in the adjustable slideway having clearance whereby such inward adjustment is permitted and means for restraining said adjustable slideway from exerting an undue pressure upon said guide.

3. In a rock-drill the combination with a cylinder and guides on said cylinder composed of longitudinal ribs, each rib having two angular faces, both of which converge toward points on a straight line drawn through both of said ribs, of a shell having stationary slideways upon which the lower faces of said longitudinal ribs engage, adjustable slideways with which the upper faces of said ribs are adapted to engage, bolts for attaching said adjustable slideways to said stationary slideways, said bolts arranged at such an angle with the connecting-faces ot the said slideways that they shall exert a constant pressure to force the adjustable slideways inwardly, and removable spacing-pieces for preventing the slideways from exerting an undue pressure upon the guides substantially as specified.

I. In a rock-drill the combination with a cylinder and guides on said cylinder composed of longitudinal ribs, each of said ribs having faces 5 6 converging substantially as shown, of a shell having stationary slideways 7 upon which the lower faces 6 of said guides engage, adjustable slideways 8 with which the upper faces 5 of said guides engage, angular faces 9 through which the said adjustable slideways engage with the said shell, bolts fitted to said shell, slotted holes in said adjustable slideways through which said bolts are adapted to pass and removable spacing-pieces 13 substantially as and for the purpose specified.

HUGH V. CONRAD. ROBERT L. AMBROSE. YVitnesses:

W. J. BARNUM, FRED. M. I'IITCHCOCK. 

